JP2549221Y2 - Waterproof structure of constant temperature spot type heat sensor - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial application field] The present invention relates to a waterproof structure of a constant temperature spot type heat sensor.

[Prior Art] A conventional constant-temperature spot-type heat sensor is mounted by exposing a heat-sensitive plate 100 to which a thermoblock 102 is attached below a main body 101 attached to a ceiling surface or the like, and fitting a protector 104 thereto. Although the structure shown in FIG. 5 is attached to the main body 101 of the thermoblock 102 from which the terminal plate 102a is led out, the margin for insertion into the fitting hole 103 of the main body 101 is small. In addition, in an environment in which dew condensation is likely to occur, dew condensation water is inferior in waterproofness and invades the inside of the filler 105 through the gap of the fitting hole 103 near the surface along a path shown by a wavy line in FIG. For example, there is a problem in that the terminal reaches the terminal plate 102a derived from the thermoblock 102.

[Problems to be solved by the present invention] The present invention has been made in view of such circumstances.
It is an object of the present invention to provide a waterproof structure suitably used for a constant-temperature spot-type heat sensor.

[Means for Solving the Problems] The waterproof structure of the constant temperature spot type heat sensor of the present invention proposed to achieve the above object is to expose a heat sensitive plate to which a thermoblock is attached below a main body. In the improvement of the constant temperature spot type heat sensor attached by mounting, in the center of the main body portion, a fitting hole having an opening formed above and below is provided, and a distal end portion of the terminal plate derived from the thermoblock is provided. Most parts except for the resin block are covered with a resin block, the upper opening of the fitting hole is closed with a terminal portion connected to a lead wire led out from the outside, and the lower opening is provided with a resin block of a thermoblock. Is inserted, and the inside of the fitting hole is water-tightly sealed with a filler.

[Operation] According to the waterproof structure of the present invention, the upper opening of the fitting hole provided in the center of the main body is closed by the terminal connected to the lead wire, and the lower opening of the fitting hole is the tip of the terminal plate. The resin block of the thermoblock whose most part except the part was covered with the resin block was inserted, and the entire inside of the fitting hole was made to be water-tightly sealed with the filler, so dew condensation occurred on the surface of the thermoblock. Even if water enters, the entered water does not reach the terminal plate.

[Embodiment] An embodiment of the present invention will be described below with reference to the accompanying drawings.

FIGS. 1 and 2 show the main structure of a constant temperature spot type heat sensor A according to the present invention, wherein 1 is a thermoblock which issues a warning by closing a contact (not shown) due to a change in ambient temperature. Thus, it is fixed to a central portion of a disc-shaped heat-sensitive plate 3 which is mounted to be exposed below the main body 2.

The two terminal plates 4, 4 derived from the thermoblock 1 are:
As shown in FIG. 4, most of the portion L except the tip portions 4a, 4a is formed and covered with a resin block 11, and the upper and lower openings are formed at the center of the main body 2. A formed fitting hole 2a is provided, an upper opening of the fitting hole 2a is closed by the terminal portion 5, and a resin block 11 of the thermoblock 1 is inserted into a lower opening to fill the inside of the fitting hole 2a. Agent 6 is filled and sealed in a watertight manner. The distal ends 4a, 4a of the terminal plates 4, 4 exposed from the resin block 11 are inserted into corresponding holes of the terminal portions and connected by solders 8, 8, as shown in FIG. A lead wire 9 led to the main body 2 from a ceiling surface or the like is connected to the terminal portion 5 by solder 8 or the like. The lead wire 9 has a structure coated with silicon so as to withstand high temperatures.

Reference numeral 10 denotes a protector for protecting the heat-sensitive plate 3 mounted in a state exposed below the main body 2, and is fitted to a fitting recess 2b formed in the main body 2. I have.

[Effects of the Invention] According to the present invention, most of the terminal plate excluding the distal end portion derived from the thermoblock is covered with the resin block,
Since the thermoblock is inserted into the fitting hole of the main body and sealed with a filler in a watertight manner, water condensed on the surface of the thermoblock does not easily enter, and the waterproof effect is high.

[Brief description of the drawings]

FIG. 1 is a structural view of a main part of the constant temperature spot type heat sensor of the present invention, FIG. 2 is an external structural view, FIG. 3 is a structural view of terminals provided inside the main body, and FIG. FIG. 5 is a structural explanatory view of a conventional constant-temperature spot-type heat sensor, and FIG. 6 is a connection structural view of a thermoblock and a main body. (Explanation of symbols) A: constant-temperature spot-type heat sensor of the present invention 1: thermoblock 11: resin block 2: main body 3: heat-sensitive plate 4: terminal plate 5: terminal 6 …filler

Claims (1)

(57) [Scope of request for utility model registration] 1. A constant-temperature spot-type heat sensor in which a heat-sensitive plate on which a thermoblock is mounted is exposed and mounted below a main body, wherein a fitting having upper and lower openings formed in the center of the main body. A mating hole is provided, and most of the terminal plate excluding the tip portion of the terminal block led out from the thermoblock is covered with a resin block. The fitting hole has an upper opening, and a lead wire led out from the outside. And the lower opening is
A waterproof structure of a constant-temperature spot-type heat sensor, in which a resin block of a thermoblock is inserted and the inside of the fitting hole is sealed watertight with a filler.